Abstract：Cockpit voice recorder (CVR) in aircraft records many cockpit voices, such as speaker voices, noises, background sounds with special meanings. Cockpit voices’ complexity exacerbates analysis difficulty through traditional differentiating & hearing methods, so that more cockpit voices’ characteristics are not resolved easily. According to the shortage in cockpit voice hearing and analyses by traditional short time Fourier transformation (STFT), the united time-frequency analysis, which is introduced into airplane cockpit voice analyses, expands CVR analysis method. Compared with these methods, time-frequency distributions and reassigned versions each has its strong point at time-frequency resolution and immunity of cross term interference, and are adapted to analyze non-stationary cockpit background sounds, and offer a method as a reference for flight accident investigatations.
李祥彬 李果 李学仁. 飞机舱音记录器背景声信息的联合时频分析[J]. , 2009, 28(1): 143-145 .
Li Xiangbin Li Guo Li Xueren . United Time-Frequency Analysis For Background Sounds of CVR. , 2009, 28(1): 143-145 .
2009, Vol. 28 
